Material interface level sensing
CA 2267900 C · Owner: Venture Measurement Company Llc · Inventors: Cournane, Thomas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus (10) for determining levels, of immiscible fluids (12 14, 16, 30) in a, vessel (18) which includes a transmission line sensor (20) that extends vertically within the vessel for contact with fluids within the vessel. A generator (22) is coupled to the sensor for transmitting along the sensor a first electrical signal that continuously sweeps a predetermined frequency range. A voltage detector (24) is coupled to the sensor for providing a second electrical signal that varies as a function of the amplitude of electrical energy reflected at the sensor from the various electrical impedance discontinuities along the sensor, including particularly interfaces (32 34, 36) between and …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed September 17, 1997 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.